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MEASURMENT OF R-CURVES FOR CERAMIC COMPOSITS,AND ITS MACROMECHANIC ANALYSIS

Research Project

Project/Area Number 07455427
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Composite materials/Physical properties
Research InstitutionKYOTO INSTITUTE OF TECHNOLOGY

Principal Investigator

NISHIDA Toshihiko  KYOTO INSTITUTE OF TECHNOLOGY PROFESSOR, 工芸学部, 教授 (30027809)

Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥500,000 (Direct Cost: ¥500,000)
KeywordsCeramics / R-Curve / Stable-fracture / Grain bridging / Piezo-spectroscopy / Strengthening by particle dispersion / Contenious fiber reinforcement / Notch preparation / 複合材料 / 破壊力学 / き裂進展抵抗 / コンプライアンス解析
Research Abstract

In order to make clear the micromechanisms governing the fracture behavior of materials, it is necessary to pursue precise characterizations giving the depecdence of the resistance showed by the material to crack propagation on the crack length (R-curve behavior). In this work, some basic problems related to the stable propagation of cracks in brittle materials have been solved. First, a technique to introduce a sharp (mum scale diameter) notch in the specimen has been developed. Then, the problem of stabilizing the crack propagation through the use of a stabilizer apparatus using the bending geometry (according to JIS) has been overcome. In such a way, the routine procedure to obtain R-curve in even very brittle materials has been well established and applied to two type of materials : 1) composite materials reinforced on the micron scale by whiskers or fiber-like (elongated) grains and, 2) composite materials reinforced on a larger scale by long fibers.
In addition to fracture mechanics characterizations, in situ spectroscopy measurements have been performed to characterize the mechanisms of fracture on the microstructural scale. As a result of this characterizations, it has been shown that mechanisms operating in the wake of the crack tip, namely, the elastic or frictional bridging, play the major role in hampering fracture propagation in brittle solids.
Finally, precise characterizations of the shear resistance of fiber-reinforced materials have also been performed with particular emphasis on relating the microscopic mechanism of interface debonding to the macroscopic failure process by shearing. The results and the final interpretation on the above fracture processes have then summarized and presented in scientific papers.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] 杉山文子,小川欽也,西田俊彦: "ダブルノッチ試験片を用いた長繊維強化型セラミックス基複合材の静的および衝撃せん断強度" 日本セラミックス協会学術論文誌. 104・10. 978-983 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 西田俊彦,小川欽也,杉山文子: "力学的異方性を備えたセラミックス系複合材のせん断強度評価" 材料科学. 33・6(印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T. Akita, S. Hirai, Y. Tanabe, E. Yasuda and T. Nishida: "The Effect of Crack Geometry on R-curve Behavior of SiC-whisker Reinforsed Al_2O_3 Composite." Proc. Inter. Conf. SAMPE. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 杉山文子,小川欽也,西田俊彦: "繊維結合型セラミックス基複合材の曲げ試験の有限要素解析" 日本機械学会学術論文誌. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 杉山文子,石川敏弘,小川欽也,西田俊彦: "繊維結合型セラミックス複合材の曲げ強度" 日本機械学会学術論文誌. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K. Ogawa, T. Nishida, G. Pezzoffi, F. Sugiyama: "Impact Strength and Fracture Energy of Si_3N_4 and Its Continuous C-fiber Composite Measured by the Split-Hopkinson Pressure Bar Method." J. Am. Ceram. Soc. (in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] S.SUGIYAMA,K.OGAWA and T.NISHIDA: "Static and Impact Shear Strength Estimation of a Continuous Carbon Fiber Reinforced Silicon Nitride using Double Notched Specimens" J.Ceram.Soc.Jpn.104-10. 978-983 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.NISHIDA,K.OGAWA and F.SUGIYAMA: "Evaluation of Shear Strength in Ceramic Composites with Mechanical Isotropic Propreties" J.Mater.Sci.Jpn.33-6 (in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] T.AKATU,S.HIRAI,Y.TANABE,E.YASUDA and T.NISHIDA: "The Effect of Crack Geometry on R-curve Behavior of SiC-whisker Reinforced Al_2O_3" Proc.Inter.Conf.SAMPE.(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] F.SUGIYAMA,K.OGAWA and T.NISHIDA: "FEM Analysis of a Continous Fiber Bonded Ceramic Composite in Bending" J.Jpn.Soc.Mech.Eng.(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] F.SUGIYAMA,T.ISHIKAWA,K.OGAWA and T.NISHIDA: "Bending Strength of a Continuous Fiber Bonded Ceramic Compsite" J.Jpn.Soc.Mech.Eng.(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] K.OGAWA,T.NISHIDA,G.PEZZOTTI and F.SUGIYAMA: "Impact Strength and fracture Energy of Si_3N_4 and its Continuous C-fiber Composite Measured by Split-Hopkinson Pressure Bar Method" J.Am.Ceram.Soc.(in press). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 杉山文子,小川欽也,西田俊彦: "ダブルノッチ試験片を用いた長繊維強化型セラミックス基複合材の静的および衝撃せん断強度" 日本セラミックス協会学術論文誌. 104・10. 978-983 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 西田俊彦,小川欽也,杉山文子: "力学的異方性を備えたセラミックス系複合材のせん断強度評価" 材料科学. 33・6(印刷中).

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Akatu,S.Hirai,Y.Tanabe,E.Yasuda and T.Nishida: "The Effect of Crack Geometry on R-curve Behavior of SiC-whisker Reinforced Al_2O_3 Composite." Proc.Inter.Conf.SAMPE.(in press).

    • Related Report
      1996 Annual Research Report
  • [Publications] 杉山文子,小川欽也,西田俊彦: "繊維結合型セラミックス基複合材の曲げ試験の有限要素解析" 日本機械学会学術論文誌. (印刷中).

    • Related Report
      1996 Annual Research Report
  • [Publications] 杉山文子,石川敏弘,小川欽也,西田俊彦: "繊維結合型セラミックス複合材の曲げ強度" 日本機械学会学術論文誌. (印刷中).

    • Related Report
      1996 Annual Research Report
  • [Publications] K.Ogawa,T.Nishida,G.Pezzotti,F.Sugiyama: "Impact Strength and Fracture Energy of Si_3N_4 and its Continuous C-fiber Composite Measured by the Split-Hopkinson Pressure Bar Method" J.Am.Ceram.Soc.(in press).

    • Related Report
      1996 Annual Research Report
  • [Publications] T.Nishida: "R-curve Behavior of Al_2O_3/ZrO_2 Composites Measured by Stable Fracture Test in Bending" J.Powder Powder Metallu.42,〔9〕. 1047-1051 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Nishida: "Measurment of Rising R-curve Behavior in a Toughened Silicon Nitride by St:ble Crack Propergation in Bending" J. Am. Ceram. Soc.87,〔11〕. 3113-3116 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] T.Nishida: "R-curve Behavior of SiC Wisker Reinforced Si_3N_4 Composites" J. Ceram. Soc. Jpn.〔発表予定〕.

    • Related Report
      1995 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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